Other
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331..902c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 15, 1988, p. 902-921. Research supported by the National Research
Other
159
Companion Stars, Dwarf Stars, Late Stars, Subgiant Stars, Variable Stars, Accretion Disks, Brown Dwarf Stars, Chromosphere, Gravitational Collapse, Line Spectra, Radial Velocity, Velocity Distribution
Scientific paper
Relative radial velocities with a mean external error of 13 m/s rms have been obtained for 12 late-type dwarfs and four subgiants over the past six years. Two stars, Chi1 Ori A and Gamma Cep, show large velocity variations probably due to stellar companions. In contrast, the remaining 14 stars are virtually constant in velocity, showing no changes larger than about 50 m/s. No obvious variations due to effects other than center-of-mass motion, including changes correlated with chromospheric activity, are observed. Seven stars show small, but statistically significant, long-term trends in the relative velocities. These cannot be due to about 10-80 Jupiter mass brown dwarfs in orbits with P less than about 50 yr, since these would have been previously detected by conventional astrometry; companions of about 1-9 Jupiter masses are inferred. Since relatively massive brown dwarfs are rare or nonexistent, at least as companions to normal stars, these low-mass objects could represent the tip of the planetary mass spectrum. Observations are continuing to confirm these variations, and to determine periods.
Campbell Bruce
Walker Gordon A. H.
Yang Sheng
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